KR20150092908A - Solenoid valve for brake system - Google Patents

Abstract

Disclosed is a solenoid valve for a brake system, capable of reducing vibration and noise of the solenoid valve when a brake system is operated. According to an embodiment of the present invention, the solenoid valve for a brake system is installed in a bore of a modulator block having an inflow passage and a discharge passage to control flow of oil between the inflow passage and the discharge passage. The solenoid valve for a brake system comprises: a valve housing installed to enter the bore and having an inner hollow hole, wherein the oil passage communicating with the inflow passage is provided to a circumference; a cylindrical sleeve coupled to an upper side of the valve housing; a valve core provided in an upper portion of the sleeve; an opening and closing member provided to the hollow hole of the valve housing, wherein the center portion is penetrated to form the passage; and an armature provided to oscillate perpendicularly inside the sleeve. A pressing unit is provided between an outer surface of the armature and the inner surface of the sleeve to block a gap between the armature and the sleeve.

Description

[0001] The present invention relates to a solenoid valve for a brake system,

The present invention relates to a solenoid valve for a brake system, and more particularly, to a solenoid valve for a brake system capable of reducing the vibration and noise of the solenoid valve during operation of the brake system.

BACKGROUND OF THE INVENTION [0002] Generally, an electronically controlled brake system is a system for effectively preventing a slip phenomenon of a wheel which may occur when a vehicle is braked, suddenly accelerated or rapidly accelerated, and includes a plurality of solenoid valves for controlling braking hydraulic pressure transmitted from a master cylinder to a wheel cylinder, An accumulator for temporarily storing the oil that has escaped from the wheel cylinder, a pump for recovering the oil that has escaped from the wheel cylinder to the master cylinder, and an ECU for controlling driving of the solenoid valve and the pump.

The plurality of solenoid valves, the accumulator, and the pump are installed in an aluminum modulator block having a flow path for forming a hydraulic circuit to control the braking hydraulic pressure.

The solenoid valve used in the brake system includes a hollow valve housing inserted into the bore of the modulator block and having an inlet port and an outlet port communicating with the inlet and outlet flow passages of the modulator block, A filter member which is installed on the outside of the valve housing to filter out foreign substances from the oil flowing into the valve housing; A valve core coupled to the sleeve opposite to the valve housing by welding, an armature movably installed in the sleeve, a sleeve and a valve housing, a second orifice formed on the upper portion of the valve body and smaller than the first orifice, An opening and closing member having an opening and closing unit for opening and closing the first orifice, And an excitation coil assembly installed outside the sleeve to generate magnetic force to move the armature forward and backward. Between the valve core and the armature, there is a restoring spring that presses the armature downward. At this time, a spring supporting portion for supporting the opening spring is provided at the lower end of the sleeve, and a spring receiving groove formed to have a step difference is provided on the upper side of the armature to stably install the restoring spring.

Patent Registration No. 10-1276072 (Mar. 18, 2013)

An embodiment of the present invention is to provide a solenoid valve for a brake system that can improve the stability of the behavior of an armature when operating the brake system.

In addition, an embodiment of the present invention is intended to provide a solenoid valve for a brake system capable of solving vibration and noise when operating a brake system.

According to an aspect of the present invention, there is provided a solenoid valve for a brake system installed in a bore of a modulator block having an inlet flow path and an exhaust flow path, the solenoid valve for controlling a flow of oil between the inlet flow path and the discharge flow path, A valve housing having a through hole formed therethrough and having an oil passage communicating with the inflow passage, a cylindrical sleeve coupled to the valve housing at an upper side thereof, a valve core provided at an upper portion of the sleeve, And an armature provided in the through hole of the valve housing and passing through the center of the valve housing to form a flow path and an armature movably movable in the sleeve, A brake system in which a pressing portion is provided so as to block a gap between the sleeves A solenoid valve can be provided.

Further, the pressing portion may be provided with a solenoid valve for a brake system including a pressurizing ring for pressing the armature and the sleeve, and a ring receiving groove provided on the outer surface of the armature for receiving the pressurizing ring.

Further, the pressurizing ring may be provided with a solenoid valve for a brake system coated with Teflon.

A solenoid valve for a brake system may also be provided between the armature and the valve core, wherein the solenoid valve for the brake system further includes an insulating member for preventing residual magnetic flux by contact between the armature and the valve core.

The solenoid valve for a brake system according to the embodiment of the present invention may provide a pressing portion between the armature and the sleeve to stabilize the behavior of the armature during operation of the brake system.

In addition, by stabilizing the behavior of the armature of the brake system solenoid valve according to the embodiment of the present invention, the vibration and noise of the solenoid valve can be reduced.

In addition, by reducing the vibration and noise of the solenoid valve for a brake system according to the embodiment of the present invention, the braking stability can be improved in operation of the brake system.

1 is a cross-sectional view schematically showing a solenoid valve for a brake system according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view showing a pressing portion of a solenoid valve for a brake system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a cross-sectional view schematically showing a solenoid valve for a brake system according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view showing a pressing portion 70 of a solenoid valve for a brake system according to an embodiment of the present invention to be.

Referring to FIGS. 1 and 2, a solenoid valve for a brake system according to an embodiment of the present invention includes a valve housing 20, a sleeve 40, a valve core 30, and an armature 60.

The valve housing 20 is installed to enter the bore 13 of the modulator block 10, but preferably is press-fit. The valve housing 20 has a through hole 22 penetrating the valve housing 20 in the vertical direction and a body 21 formed around the valve housing 20 and having an oil passage 23 communicating the inside and the outside. The oil passage 23 communicates with the inflow passage 11 of the modulator block 10 and is provided with a filter member 25 (not shown) in the oil passage 23 so as to filter foreign substances from the oil flowing through the inflow passage 11. [ ). The body portion 21 and the filter member 25 may be integrally formed in the valve housing 20 by an injection molding method.

The body portion 21 has a cylindrical shape and forms an appearance of the valve housing 20. [ More specifically, an upper portion of the body portion 21 is provided with an insertion portion which is press-fitted into the sleeve 40, and a coupling protrusion for engaging with and supporting the modulator block 10 is protruded from the outer surface. A through hole (22) passing through the inside of the body (21) is formed with a stepped stepped portion having a smaller diameter than the inner diameter of the through hole (22).

On the other hand, the oil passage 23 communicates with the inlet passage 11 of the modulator block 10, and the first orifice 24 communicates with the drain passage 12 of the modulator block 10. At this time, the oil passage 23 is formed around the body portion 21 in the vicinity of the upper side in the vicinity of the first orifice 24 to communicate with the through-hole 22. This is to prevent the oil from flowing into the discharge passage 12 when the first orifice 24 is closed by the opening and closing member 50.

The sleeve 40 has a vertically open cylindrical shape, and its lower inner diameter has an upper outer diameter of the valve housing 20, that is, a diameter corresponding to the outer diameter of the insertion portion. Thus, the insertion portion is press-fitted into the sleeve 40 through the lower end of the sleeve 40. In this manner, the pressing portion between the insertion portion and the sleeve 40 is welded and fixed.

Although the solenoid valve according to one embodiment of the present invention is shown as an example of a solenoid valve coupled by the welding method as described above, the solenoid valve may be coupled by a press fitting method instead of a welding method.

The opening and closing member 50 is located in the through hole 22 of the body portion 21 as shown in FIG. 1 and has an inner flow passage 51 passing through the center portion in the longitudinal direction so that oil can flow therein, And a first opening and closing part 52 for opening and closing the first orifice 24 on the lower side. A second orifice 53 having an inner diameter smaller in diameter than the inner diameter of the first orifice 24 is formed on the upper side of the opening and closing member 50.

The valve core 30 is press fit on the top of the sleeve 40 to close the open top of the sleeve 40. The valve core 30 and the sleeve 40 can be fixedly coupled by welding. The coupling by such a welding method is an example of one of the coupling methods. A coupling groove is formed in the valve core 30 for more close coupling between the valve core 30 and the sleeve 40, and the sleeve 40 ), So that it can be fixed.

The armature 60 is vertically movably installed in the sleeve 40. The armature 60 has a cylindrical shape with an outer diameter corresponding to the inner diameter of the sleeve 40 and a hollow portion through which oil flows in the vertical direction. The inner flow path 61 is provided so as to pass through the inside of the armature 60 so as to communicate with the inflow path 11.

A slot is formed in the outer surface of the armature 60 in the longitudinal direction so that a side slot 65 is provided so that oil can move. The side slots 65 are provided so that the space on the inlet channel 11 and the space on the armature 60 are communicated with each other.

The second opening / closing portion 64 is provided at the lower end of the armature 60 to close the second orifice 53 of the opening / closing member 50. That is, the second opening / closing portion 64 opens / closes the second orifice 53 by the advancing / retreating operation of the armature 60. [

A restoring spring 62 is provided between the armature 60 and the valve core 30 for urging the armature 60 toward the opening and closing member 50. The restoring spring 62 is accommodated in the spring receiving groove formed in the upper portion of the armature 60. [ That is, the restoring spring 62 accommodated in the spring receiving groove presses the armature 60 toward the opening / closing member 50 so that the second opening / closing portion 64 normally closes the second orifice 53.

Between the outer surface of the armature 60 and the inner surface of the sleeve 40, a pressing portion 70 is provided so that the behavior of the armature 60 is stabilized during operation of the brake system. The pressing portion 70 is provided to press the armature 60 and the sleeve 40 by pressing so as to prevent the armature 60 from generating vertical or lateral vibration due to the gap with the sleeve 40, Can be stabilized. By stabilizing the behavior of the armature 60, vibration and noise of the solenoid valve are reduced during brake operation.

The pressing portion 70 includes a pressing ring 71 for pressing the armature 60 and the sleeve 40 and a ring receiving groove 72 provided on the outer surface of the armature 60 to receive the pressing ring 71 do.

The ring receiving groove 72 may have a groove circumferentially formed on the inner surface of the sleeve 40 so as to receive the pressing ring 71 even if the ring receiving groove 72 is not the outer surface of the armature 60.

The pressing ring 71 may be made of an elastic material. Further, the presser ring 71 may be provided to have an outer diameter larger than the outer diameter of the armature and smaller than the inner diameter of the sleeve 40.

The pressing ring 71 can be coated with Teflon, which is a material having a low friction coefficient. The pressing ring 71 coated with Teflon can reduce the frictional force due to the contact with the sleeve 40. [ Further, the pressure ring 71 coated with Teflon can smoothly move on the inner surface of the sleeve 40 because there is no fluid absorption and less friction.

Meanwhile, an insulating member 63 may be provided between the armature 60 and the valve core 30. As the armature 60 and the valve core 30 come into contact with each other, even when the power is applied and then not applied, the residual magnetic flux remains inside the valve so that the normal operation of the solenoid valve is interrupted. The insulating member 63 is made of a material whose current is not conducted so as to prevent such residual magnetic flux.

The insulating member 63 may be provided between the upper surface of the armature 60 and the lower surface of the valve core 30 in the form of a disk or a ring. When the insulating member 63 is provided in a ring shape, the surface should be formed so as not to contact the surface other than the surface contacting the insulating member 63 in at least one of the upper surface of the armature 60 and the lower surface of the valve core 30.

An excitation coil assembly (not shown) provided in a cylindrical shape on the upper outer surface of the valve core 30 and the sleeve 40 is provided to advance and retreat the armature 60 as described above. The excitation coil assembly includes a cylindrical coil case, a bobbin received in the coil case, and an excitation coil wound on the outer surface of the bobbin. The excitation coil assembly is configured to allow the armature 60 to be moved toward the valve core 30 by opening the second orifice 53 when a power is applied to the excitation coil to open the second orifice 53, The detailed description will be omitted.

The opening and closing operation of the solenoid valve for a brake system having the above structure will now be described with reference to FIG.

1, the restoring spring 62 pushes the armature 60 toward the second orifice 53 so as to move the second orifice 53 toward the second orifice 53. As a result, Closing. Therefore, at this time, the oil does not flow from the inflow passage 11 to the discharge passage 12 of the modulator block 10. [

When the excitation coil assembly is energized, the armature 60 moves to the valve core 30 due to the magnetic force acting between the armature 60 and the valve core 30, against the elastic force of the restoring spring 62. Thus, the second opening / closing portion 64 is separated from the second orifice 53 to open the second orifice 53. When the second orifice 53 is opened, the oil passes through the oil passage 23 of the valve housing 20 and the through hole 22 and the sleeve 40 Lt; / RTI > The oil flows through the second orifice 53 of the opening and closing member 50 to the discharge flow path 12 via the inner flow path 51.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

10: Modulator block 11: Inflow channel
12: Exhaust flow path 13:
20: valve housing 21:
22: through hole 23: oil passage
24: first orifice 25: filter element
30: valve core 40: sleeve
50: opening / closing member 51:
52: first opening and closing part 53: second orifice
60: armature 61: inner flow path
62: restoring spring 63: insulating member
64: second opening and closing part 65: side slot
70: pressing portion 71: pressing ring
72: ring receiving groove

Claims (4)

A solenoid valve for a brake system installed in a bore of a modulator block having an inlet flow path and an outlet flow path to control oil flow between the inlet flow path and the discharge flow path,
A valve housing having a through hole formed in the bore to penetrate therethrough and having an oil passage communicating with the inflow passage, a cylindrical sleeve coupled to an upper side of the valve housing, An opening and closing member provided at a through hole of the valve housing and having a central portion penetrating to form a flow path; and an armature movably movable in the sleeve,
And a pressing portion is provided between the outer surface of the armature and the inner surface of the sleeve so as to block a gap between the armature and the sleeve. The method according to claim 1,
Wherein the pressing portion includes a pressing ring for pressing the armature and the sleeve, and a ring receiving groove provided on the outer surface of the armature for receiving the pressing ring. 3. The method according to claim 1 or 2,
Wherein the pressure ring is coated with Teflon. The method according to claim 1,
And an insulating member is provided between the armature and the valve core to prevent residual magnetic flux by contact between the armature and the valve core.

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